Analyze The Working Principle of RenhotecIC Ozone Generator

 

Ozone Generator Overview

Ozone Generator Overview Ozone generator is an equipment device used to produce ozone. Ozone is easy to decompose and cannot be stored. It needs to be prepared and used on site (but in special cases, it can be stored for a short time). Any place where ozone can be used needs to use an ozone generator. Ozone generators are widely used in tap water, sewage, industrial oxidation, space sterilization and other fields.

Ozone is a broad-spectrum efficient bactericidal disinfectant recognized worldwide. Use air or oxygen as raw material to generate ozone by high-frequency and high-voltage discharge. Ozone has one more active oxygen atom than oxygen molecules, and its chemical properties are particularly active. It is a strong oxidant and can quickly kill bacteria in the air at a certain concentration. There is no toxic residue and no secondary pollution. It is known as "the cleanest oxidant and disinfectant".

Ozone Generator Classification

According to the way of ozone generation, there are three main types of ozone generators: high-voltage discharge type, ultraviolet irradiation type, and electrolytic type.

 

1 high voltage discharge generator

This type of ozone generator uses a high-voltage current of a certain frequency to create a high-voltage corona electric field, so that the oxygen molecules in or around the electric field undergo electrochemical reactions to produce ozone.

This kind of ozone generator has the advantages of mature technology, stable work, long service life, large ozone output (single machine can reach 1Kg/h), so it is the most widely used ozone generator in related industries at home and abroad.

In the high-voltage discharge ozone generator, it is divided into the following types:

1. According to the high-voltage frequency of the generator, there are three types: power frequency (50-60Hz), intermediate frequency (400-1000Hz) and high frequency (>1000Hz). Due to the shortcomings of large size and high power consumption, power frequency generators have basically withdrawn from the market. Medium and high frequency generators have the advantages of small size, low power consumption, and large ozone production, and are the most commonly used products now.

2. According to the gas raw materials used, there are two types: oxygen type and air type. The oxygen type is usually supplied with oxygen from an oxygen cylinder or an oxygen concentrator. The air type usually uses clean and dry compressed air as raw material. Since ozone is produced by oxygen, and the oxygen content in the air is only 21%, the ozone concentration produced by the air type generator is relatively low, while the oxygen purity of bottled or oxygen concentrators is above 90%, so the oxygen type The generator has a higher ozone concentration.

3. According to the cooling method, there are water-cooled type and air-cooled type. When the ozone generator is working, it will generate a lot of heat energy and needs to be cooled, otherwise the ozone will be decomposed while being generated due to high temperature. The water-cooled generator has good cooling effect, stable operation, no ozone attenuation, and can work continuously for a long time, but the structure is complicated and the cost is slightly higher. The cooling effect of the air-cooled type is not ideal, and the ozone attenuation is obvious. High-performance ozone generators with stable overall performance are usually water-cooled. Air cooling is generally only used for middle and low-grade ozone generators with small ozone output. When selecting a generator, try to use a water-cooled type.

4. Divided by dielectric materials, there are several types of quartz tubes (a type of glass), ceramic plates, ceramic tubes, glass tubes and enamel tubes. At present, ozone generators made of various dielectric materials are sold on the market, and their performances are different. Glass dielectrics are low in cost and stable in performance. They are one of the earliest materials used in artificial ozone production, but their mechanical strength is poor. Ceramics are similar to glass, but ceramics are not suitable for processing, especially in large ozone machines. Enamel is a new type of dielectric material. The combination of dielectric and electrode has high mechanical strength and can be precisely processed with high precision. It is widely used in large and medium-sized ozone generators, but its manufacturing cost is relatively high.

5. According to the structure of the ozone generator, there are two kinds of gap discharge type (DBD) and open type. The structural feature of the gap discharge type is that ozone is generated in the gap between the inner and outer electrodes, and the ozone can be collected and output in a concentrated manner and used at a higher concentration, such as for water treatment. The electrodes of the open generator are exposed to the air, and the generated ozone is directly diffused into the air. Due to the low concentration of ozone, it is usually only used for air sterilization in a small space or surface disinfection of some small items. Gap discharge generators can be used instead of open generators. But the cost of gap discharge ozone generator is much higher than that of open type.

2 UV ozone generators

This type of ozone generator uses ultraviolet rays of a specific wavelength (185mm) to irradiate oxygen molecules to decompose the oxygen molecules to generate ozone. Due to the large size of the ultraviolet lamp, low ozone production and short service life, this generator has a narrow range of use and is often used on disinfection cupboards.

3 electrolytic generators

This type of ozone generator usually generates ozone by electrolyzing purified water. The generator can produce high-concentration ozone water, has low manufacturing cost, and is easy to use and maintain. However, due to the shortcomings of ozone production cannot be increased, electrode life is short, ozone is not easy to collect, etc., its scope of use is limited. At present, this generator is only used on some specific small equipment or in some specific places, and does not have the conditions to replace the high-voltage discharge generator.

Ozone Concentration and Effect

Ozone is a mixed gas whose concentration is usually expressed by mass ratio and volume ratio. The mass ratio refers to the amount of ozone contained in the mixed gas per unit volume, usually expressed in units of mg/L or g/m3. The volume ratio refers to the volume content or percentage content of ozone in a unit volume, expressed in percentages such as 2%, 5%, 12%, etc. Ppm is commonly used in the health industry to represent the ozone concentration, that is, one millionth of the volume of ozone in a cubic ozone mixed gas is 1ppm. Ozone concentration is an important indicator to measure the technical content and performance of the ozone generator. Under the same working conditions, the higher the ozone output concentration, the higher the quality. The main factors affecting the ozone concentration are 1. The structure and processing accuracy of the ozone generator; 2. Cooling methods and conditions; 3. Driving voltage and driving frequency; 4. Dielectric materials; clean and dry. Ozone production refers to the ozone output per unit time of the ozone generator; the product of the ozone concentration value and the total gas volume entering the ozone generator is the ozone production; usually expressed in units of mg/h, g/h, kg/h . The ozone generator standard stipulates that the specifications and models of the ozone generator are expressed and distinguished by the ozone output. The small ozone generator uses g/h as the unit, and the large ozone generator uses kg/h as the unit to distinguish the size of the specification.

Ozone Generator Selection

The selection of ozone generator is very important and should be selected from the following aspects:

1. Determine the model of the ozone generator, that is, the ozone output. When purchasing an ozone generator, you must first determine its use, whether it is used for air sterilization and deodorization or for water treatment. When used for air treatment, you can choose a low-concentration, economical open-type ozone generator, which includes two open types with gas sources and open types without gas sources. It is best to choose models with gas sources. This type of ozone generator has a simple structure and low price, but the temperature and humidity during operation affect the amount of ozone generated. The above-mentioned open type ozone generator is the simplest ozone device, and a high-concentration ozone generator should also be selected for air treatment in places with high requirements. When air treatment, put it in according to the standard of 20-50mg/m3, and choose a high value for the food and drug industry. The total amount of ozone (that is, the output of the ozone generator) can be obtained by converting according to the size of the space. When used for water treatment, a high-concentration ozone generator must be purchased (ozone concentration greater than 12mg/L), and low-concentration ozone is ineffective for water treatment. The high-concentration ozone generator is equipped with gas source, gas source treatment device and ozone generator as standard configuration. Small ones can be designed as an integrated model with an output of 5-200g/h, and large and medium-sized ozone generators basically exist in the form of units.

2. Identify the quality of the ozone generator. The quality of the ozone generator can be identified from many aspects such as manufacturing materials, system configuration, cooling method, working frequency, control method, ozone concentration, gas source and power consumption indicators. A high-quality ozone generator should be made of high-dielectric materials, standard configuration (including gas source and purification device), dual-electrode cooling, high-frequency drive, intelligent control, high ozone concentration output, low power consumption and low gas source consumption.

3. Cost-effective. High-quality ozone generators are designed according to their standards from design to configuration and manufacturing materials, and the cost is much higher than that of low-grade generators and low-configuration generators. However, the performance of high-quality ozone generators is very stable, and the ozone concentration and output are not affected by environmental factors. The low-configuration ozone generator is greatly affected by the environment when it works, and the increase in temperature and humidity can greatly reduce the ozone production and concentration, which will affect the treatment effect. When purchasing, you should make a comprehensive comparison of its price and performance.

4. Prevent misunderstandings. A. Find out whether the ozone generator contains a gas source, and the cost of a generator with a gas source and a generator without a gas source vary greatly. If you purchase an ozone generator without a gas source through the price advantage, you also need to configure the gas source device yourself, which may end up costing more. B. Understand the structural form of the generator, whether it can run continuously, the ozone output concentration and other indicators. For example, an ozone generator is required for water purification. If an open ozone generator is selected by mistake, it cannot be used. D Confirm the rated output of the ozone generator, whether it is marked with the air source or the output marked with the oxygen source. Because when the ozone generator uses an oxygen source, the ozone output is twice as large as that when using an air source, and the cost of the two is nearly doubled. When purchasing an ozone generator, the supply and demand sides should communicate in all directions to avoid misunderstandings, and do not use the price as the main reference to measure the ozone generator.

5. Backup machine. For places where continuous work is not allowed to stop, there should be a spare machine when purchasing an ozone generator. Purchasing according to the principle of dual use and one standby, one use and one standby. The standby unit is mainly used alternately in the process of equipment maintenance or repair, so as to avoid the interruption of normal production due to downtime maintenance.